| proton | | special type of nonmetal which are nonreactive |
| lewis structures | | heterogeneous matter composed of two or more pure substances, each of which retains its identity and specific properties |
| neutrron | | changes that result in changes in the composition of the substance |
| cation | | any pure substance that can broken down by chemical means into twop or more different simple substances |
| electronegativity | | region of space surrounding the nucleus of an atom in which there is a high probability of finding up to two electrons |
| heterogeneous matter | | joules of heat required to raise the temperature of 1 g of a substance by one degree C or K |
| mixture | | subatomic particle with a relative charge of -1; existing outside the nucleus |
| anion | | the attractive forces that hold atoms together as compounds |
| ion | | method of expressing the covalent bonds among atoms in a molecule using the octet rule and dots to represent bonds |
| homogeneous matter | | any ion carrying a negative charge |
| polyatomic ion | | any ion carrying a positive charge |
| nucleus | | elements with a high luster,good conductors of electricity, and ductile. |
| covalent bond | | chemical bond in which two atoms share two pairs of electrons |
| kinetic energy | | matter that is not uniform in composition and properties throughout the sample, rather two or more distinct sunbtances unequally distributed. |
| physical change | | smallest particle of a pure substance that can exist and undergo chemical changes. |
| double bond | | chemical bond formed by transfer of electrons from atom to atom. apositive and negative charged ion are held together. |
| atomic mass | | degree to which an atom attracts a pair of covalently bonded electrons to itself. |
| ionic bond | | matter that is uniform in composition and properties throughout the sample |
| metalloid | | all changes in a substance other than changes in its chemical composition |
| isotope | | energy possesed by a substance by virtue of its motion |
| orbital | | atom in which the number of electrons does not equal the number of protons |
| atomic number | | any pure substance that cannot be broken down into two or more different simple substances. |
| element | | any atom having the same atomic number as number of protons but different mass |
| electron | | number of protons in the nucleus of an element's atom |
| solution | | homogeneous mixture involving two or more substances; composition can be varied within limits. |
| chemical bonds | | method of expressing the chemical bonds among atoms in a molecule using lines to repesent the bonds. |
| molecule | | type of chemical bond formed by the sharing of electrons between two atoms. |
| specific heat | | an arbitrarily assigned value of exaclty 12 amu for an atom of carbon-12. |
| chemical changes | | elements that lie on the colored stair step line with both metallic and nonmetallic properties. |
| nonmetals | | energy possesed by a substance by virtue of its position in space or its chemical composition |
| atom | | elements that combine with metals and other nonmentals,poor conductors of heat,and brittle. |
| compound | | smallest piece of an element that can exist and still exhibit the properties of that element. |
| noble gas | | small dense region at the center of an atom containing nearly all the mass of the atom |
| metal | | subatomic particle with a charge of 1 existing inside nucleus |
| potential energy | | subatomic particle with no chage located in the nucleus |
| structural formula | | any ion made up of more than one atom |
